[ubuntu] Problem installing Pixma IP3600 driver

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Friend of mine running Ubuntu 8.04 on a new Dell Inspiron desktop. Bought a Canon Pixma IP3600 printer.
We found a driver on the Canon Europe web site.
Downloaded it, was a deb archive containing 3 packages:
cnijfilter-common_3.00-1_i386.deb
cnijfilter-common-3.00-1.tar.gz
cnijfilter-ip3600series_3.00-1_i386.deb
We double clicked on the first one above, it ran a package installer.
We double clicked on the second one the tar, it opened showing a bunch of files.
Double clicked on the last one and it ran a package installer
Now the printer works BUT resolution is limited to 600 and some features may be missing from the options.
QUESTION: What to do with the second file, the tar.gz. Where does it go what does it do?
We have no idea.
Help appreciated
(Hardware)

Hi !I'd like to install my printer (Canon PIXMA iP100) but it doesn't work.I've downloaded the packages on Canon Official Website here : http://www.canon.co.uk/Support/Consumer e=downloadbut when I try to install cnijfilter-common_2.90-1_i386.deb I got this message :Error : Failed to satisfy all dependencies (broken cache)Hope you can help me, thank.(+ I'm a beginner, pl